diff options
Diffstat (limited to 'src/lzw.h')
| -rw-r--r-- | src/lzw.h | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -106,4 +106,29 @@ lzw_result lzw_decode_continuous(struct lzw_ctx *ctx, const uint8_t ** const data, uint32_t *restrict used); +/** + * Read LZW codes into client buffer, mapping output to colours. + * + * Ensure anything in output is used before calling this, as anything + * on the there before this call will be trampled. + * + * For transparency to work correctly, the given client buffer must have + * the values from the previous frame. The transparency_idx should be a value + * of 256 or above, if the frame does not have transparency. + * + * \param[in] ctx LZW reading context, updated. + * \param[in] transparency_idx Index representing transparency. + * \param[in] colour_map Index to pixel colour mapping + * \param[in] data Client buffer to fill with colour mapped values. + * \param[in] length Size of output array. + * \param[out] used Returns the number of values written to data. + * \return LZW_OK on success, or appropriate error code otherwise. + */ +lzw_result lzw_decode_map_continuous(struct lzw_ctx *ctx, + uint32_t transparency_idx, + uint32_t *restrict colour_table, + uint32_t *restrict data, + uint32_t length, + uint32_t *restrict used); + #endif |